Process for dyeing and waterproofing



UNITED STATES ALFRED O. TATE, OF NEW YORK, N. Y.

PROCESS FOR DYEING AND WATERPROOFING.

No Drawing.

To all whom it may concern:

Be it known that I, ALFRED O. TATE, a subject of the King of Great Britain, and residing in the city, county, and State of New lork, have invented or discovered a new and useful Process for Dyeing and Waterproofing, of which the following is a disclosure.

My improved process relates to anilin black dyeing and is the result of a combination or bringing together of certain old steps used in anilin dyeing with the several steps constituting the process or method for waterproofing described in my prior Patents Nos. 1,208,400; 1,215,077; 1,228,986; and 1,228,987, in such a way as to produce a new process giving a result superior to any heretofore obtainable. In the dyeing of cotton and silk, as heretofore practised, it has been customary to impregnate the fabric with a mixture of anilin salt and chlorate of potassium or chlorate of soda, preferably in conjunction with a metallic salt, such as copper sulfate and then to develop the color by the process known as aging, which ordinarily consists in exposing the material so impregnated to the action of warm moist air until the first stage of oxidation has been reached, the final oxidation being effected by passing the material as it comes from the aging chambers through a solution of a chromate or bi-chromate of an alkali.

This final step usually referred to as the chrome bath step, is objectionable in that it is difficult to maintain the chrome bath of uniform strength and it frequently results in tendering or weakening the goods and moreover it is difiicult to produce the desired black, uniform n shade and quality and free from any objectionable tint of green or any other color.

According to my improved process this J last step of passing this fabric throughthe chrome bath is omitted and the fabric is taken directly from the aging chamber to suitable machines adapted to give it the waterproofing treatment described in my said patents, that is to say, it is impregnated Specification of Letters Patent.

Patented Apr. 5, 1921..

Application filed. April 20, 1920. Serial No. 375,348.

with a saponaceous liquid such as sodium palmltate and aluminum acetate or sulfate and passed between aluminum electrodes and subjected to the eflects of an electric current flowing between such electrodes. This method of waterproofing is described more partlcularly and in detail in my Patent No. 1,208,400 and with modifications and improvements in my I Patent No. 1,228,987.

Machines for carrying out this waterproofing method are fully described in my Patents Nos. 1,215,077; 1,228,986; and 1,228,987, and I have found that when the ordinary anilin black process is modified b eliminating the final step as above describe and the material is taken direct from the aging chamber to my waterproofing machines of the type above described operated in the usual way to effect waterproofing that there is produced a black which will not change color or green and that the fabric is somewhat stronger than when treated by the old method, that is to say, to the chrome bath. The fabric, moreover, is waterproof and as the process is continuous, it may be economically carried out and all irregularities due to the weakening of the chrome bath eliminated.

Having now described my patent, what I claim is 1. The process for dyeing and waterproofing fabric which consists in impregnating the fabric with the ordinary anilin black dye-stuffs, aging the fabric so treated, and then subjecting the fabric to the action of a saponaceous liquid and an aluminum salt and to the action of an electric current.

2. The process for dyeing and waterproofing fabric which consists in impregnating the fabric with the ordinary anilin black dye-studs, aging the fabric so'treated, impregnating the fabric with sodium palmitate and aluminum salt and subjecting the fabric to an electric current while passing between electrodes, one of which is aluminum.

ALFRED O. TATE 

